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However on a well maintained computer you may not have all that many orphaned files and msizap can only recover a small amount of drive space.
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In my previous article on using a utility named “msizap” I showed how you can reduce the size of this folder by deleting orphaned files. The C:\Windows\Installer folder is where some but not all applications uninstall files and folders are stored. Here is a relatively simple solution to the problem. Some laptops that may only be a few years old could have relatively small hard drives and free drive space is at a premium.
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Over time this folder can grow to over a Gigabyte or more in size. Windows Installer Folder – Is it safe to delete
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